Both Windows pc and NAS are hooked up to my ASUS AC66U router via cat5e cablesBeen moving movies and files all day (drag/drop into file station) and averaging 5-12MB/s

Is this normal speed?

My MB, ASUS p8z68-v/gen3 has gigabyte nic card, its set to that/full duplex in windows 8. Jumbo Frames is off on it, router, and the NAS. Seems the speeds are not very fast at all. I doubt my Bitdefender Security suite (AV/Firewall) is contributing to this slow speed. Suggestions?

So your router and pc are gig - but what about the nas? What is the model number on your nas?

Just because your pc or nas has gig interfaces does not mean they are connected at gig - do the lights on the routers lan ports show gig speeds or 100?

5 to 12MBps would be normal for a 100mbit connection.

And just because your a fan of your AV software does not mean it does not slow down transfers. If your scanning the file(s) as you transfer them, there is going to be a performance hit no matter what AV it is. How big of hit is the question..

Normally gig speeds should be over the 30MBps for sure.. Upwards of 90, so here is quick drag and drop of a file to my File server

So while speeds your seeing are normal for 100mbit connection, they are no where close to what you should be seeing on a gig network. No jumbo frames on my network either, they are more trouble then they are worth in a home setup.

Try a robocopy of a large file - this will give you an exact number and time to work with. I don't always believe the dialogs reported speeds Especially if your doing a large number of files. So pick 1 large file as your test.

I have a DS213+ and I get around 90-95MBps through my Gigabit switch. I tried connecting everything through my BT Home Hub 4, but only one of the ports is Gigabit for some reason, the others are 100Mbps, so the speeds dropped to around 10MBps. I'm now back on my gigabit switch and all is well again.

^and without jumbo you would be seeing the same I bet. As you saw in my tests I posted, and I am not running jumbo. Do you have other devices on the network, do they ALL support jumbo?

I found little use of jumbo in a home setup, just rarely any point - not all devices nics are going to support the same size frames if jumbo at all. My printer for example sure does not support jumbo.

Kindle and IPad sure don't - so little point in having that on the nas if wanting to stream video/music from it to those types of devices.

Your internet sure does not support jumbo.. So it comes into play when you move files between your pc and nas, and will save you a few cpu cycles at best.. Its not going to make any sort of drastic speed difference.

^and without jumbo you would be seeing the same I bet. As you saw in my tests I posted, and I am not running jumbo. Do you have other devices on the network, do they ALL support jumbo?

I found little use of jumbo in a home setup, just rarely any point - not all devices nics are going to support the same size frames if jumbo at all. My printer for example sure does not support jumbo.

Kindle and IPad sure don't - so little point in having that on the nas if wanting to stream video/music from it to those types of devices.

Your internet sure does not support jumbo.. So it comes into play when you move files between your pc and nas, and will save you a few cpu cycles at best.. Its not going to make any sort of drastic speed difference.

Without jumbo frames, it was averaging 50 MB/s, so I'd say it made a huge difference - the file transfer took much less time with jumbo frames enabled, copying it to a different folder (same ISO file). Everything on the wired network supports jumbo frame, as they all run 1Gbps. All the wireless devices (Printer/2x laptops/3x tablets/1x phone) probably don't. Sorry to threadjack OP